IEC 60502 Cable
International Standard IEC 60502 from the International Electrotechnical Commission sets out the specification for power cables with extruded insulation with a voltage rating of 1kV to 30kV.
This standard also covers their accessories. The cables must have an extruded solid insulation and may contain longitudinal water-blocking properties such as swellable tapes and powders if the installation conditions demand it.
Many of the cables manufactured in accordance with IEC 60502 are designed for local power distribution, and for power and auxiliary controls. Where additional mechanical protection is provided, the cables are suitable for installation in masonry and concrete. The water-blocking properties are important to prevent water ingress when used in wet conditions.
IEC 60502-2 cable
This Standard is divided into the following parts:
|1||1kV to 3kV|
|2||6kV to 30kV|
|3||Reserved for future development|
|4||Test requirements on accessories for cables with a voltage rating from 6kV to 30kV|
Scope of IEC 60502-1
IEC 60502-1 Systems categories
|A||Systems in which any phase conductor that comes in contact with earth or an earth conductor is disconnected from the system within 1 minute|
|B||Systems which, under fault conditions, are operated for a short time with one phase earthed (not exceeding 8hrs on any occasion and no more than 125hrs per annum)|
|C||All systems which do not fall into category A or B|
IEC 60502-1 Cable properties
|Thermoplastic - intended for cables with voltage rating smaller or equal to 3kV|
|Polyvinly Chloride (PVC)|
|Ethylene Propylene Rubber or similar (EPR or EPDM)|
|High modulus or hard grade ethylene propylene rubber (HEPR)|
|Cross-linked Polyethylene (XLPE)|
|Polyvinyl Chloride (PVC)|
|Polymers similar to above|
|Class 1 or Class 2|
|Metal-coated annealed copper|
|Metal-coated copper according to IEC 60228|
Some cables meeting the requirements of IEC 60502 benefit from armoured layers, making them able to withstand a higher degree of mechanical stress than comparative sized unarmoured cables. Various types of armour are specified, such as concentric copper wire screens and/or helically wound copper tape as required in the N2XCH cable.
International power cables
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